Preliminary Checks

WARNING: This page is about a different car, the 1996 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.

Before diagnosing problems in ignition system, ensure following systems and components are in good condition and operating properly.

Battery.
State of engine tune.
Fuel delivery and injection system.
All wiring and vacuum connections.
Air cleaner and ducts.
Cooling system.